2 Samuel 10:15-19

New International Version

¹⁵ After the Arameans saw that they had been routed by Israel, they regrouped. ¹⁶ Hadadezer had Arameans brought from beyond the Euphrates River; they went to Helam, with Shobak the commander of Hadadezer’s army leading them.

¹⁷ When David was told of this, he gathered all Israel, crossed the Jordan and went to Helam. The Arameans formed their battle lines to meet David and fought against him. ¹⁸ But they fled before Israel, and David killed seven hundred of their charioteers and forty thousand of their foot soldiers.^[a] He also struck down Shobak the commander of their army, and he died there. ¹⁹ When all the kings who were vassals of Hadadezer saw that they had been routed by Israel, they made peace with the Israelites and became subject^(A) to them.

So the Arameans^(B) were afraid to help the Ammonites anymore.